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    <title>Title</title>
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<h2><a href="g1.html" target="_parent"> 功能1</a></h2>
<h2><a href="g2.html" target="_self">功能2</a></h2>
<h2><a href="g3.html" target="s">功能3</a></h2>
<h2><a href="g4.html" target="s">功能4</a></h2>
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